Mirena - Is it worth getting?

I am 32 and have no children. My doctor is making me get off the pill because af medical reasons. After reading the reviews I am a little nervous. My periods are very light now being on the pill, how does that usually correlate with Mirena or does it at all? It is not covered at all by my insurance, so I just want to be sure I am making the right decision.

For one thing, IUDs can scar the uterine lining/wall making it more difficult to conceive. They can embed themselves in the uterine lining (causing scarring). Occasionally the uterus is perforated upon placement. There are higher rates of PID (pelvic inflammatory disease) among women who use IUD's, especially women who have more than one partner, and PID can lead to infertility (again from scarring).This is something that they dont always tell you. Also, FDA approval was given for only women who have had at least one child not nulliparous women (women who have never been pregnant)